faizullah mansouri

One of the most successful advances in bacteria is transmission of antibiotic resistance genes by integrons, which leads to the emergence of multiple drug resistant (MDR) species. The aim of this study was to determine the prevalence of class 1 and 2 integron among Escherichia coli (E. coli) isolated from children with urinary tract infection (UTI) in Imam Reza hospital, Kermanshah City, Iran, in 2016.
In this cross-sectional study, 89 Escherichia coli isolates were collected. After identification by biochemical tests, and evaluating antibiotic susceptibility tests using disk diffusion method, the frequency of class 1 and 2 integron were determined using specific primers and polymerase chain reaction (PCR) methods.
Findings: Of total of 89 studied samples, 53 (59.03%) isolates were multiple-drug resistant. The highest antibiotic resistance of isolates was to ampicillin (85.4%), and co-trimoxazole (68.5%), and the lowest was to imipenem (12.4%) and nitrofurantoin (16.8%). Frequency of class 1 and class 2 integron were 71.9% and 3.5%, respectively. There was significant relationship between the frequency of integrons and resistance to tetracycline and gentamicin (P The results showed that, in addition to the high prevalence of multiple-drug resistant isolates, the frequency of class I integron was also high in Escherichia coli species. Therefore, identifying frequency of integrons and their relationship with drug resistance patterns in bacterial isolates seems to be necessary.

One of the most common infections in patients with high mortality rate is ventilator-dependent pneumonia. This study aimed to determine the frequency of extended spectrum beta-lactamase (ESBL) in Klebsiella pneumonia isolated from patients with ventilator-associated pneumonia in Kermanshah City, Iran.
This study performed on tracheal tube samples of patients admitted to the intensive care units. After collecting specimens, 57 Klebsiella pneumonia isolates were confirmed via standard bacteriological and biochemical tests. After antibiotic susceptibility testing by using disk diffusion method, the presence of ESBL phenotype was determined via combined disk test. The frequency of ESBL genes was determined by using their specific primers and polymerase chain reaction (PCR) method.
Findings: From 57 isolates of Klebsiella pneumonia, 22 (38.6%) were positive for ESBL, phenotypically. The highest genotype frequency was shv gene (31.6%) determined via PCR test. The highest resistance was to ceftriaxone and co-trimoxazole (78.9%), and the lowest resistance was to colistin (3.5%).
Considering the high resistance of Klebsiella isolated from samples of patients with ventilator- associated pneumonia against third-generation cephalosporin and the prevalence of ESBL-producing strains among these patients, identification of isolates with ESBL and suitable antibiotic selection for the treatment of this patients seem to be necessary.

Escherichia coli (E. coli), as the main cause of urinary tract infections among most of the age groups including children, due to extended-spectrum beta-lactamases (ESBL) producing has high ability to acquire antibiotic resistance. The purpose of this study was to determine the frequency of ESBL-producing genes in E. coli extracted from urine samples of children in Kermanshah City, Iran.
In this cross-sectional study, 95 E. coli isolates were identified via specific biochemical methods. After determination of antibiotic susceptibility using disk diffusion, ESBL-producing isolates were determined by using phenotypic combined disk (double-disk synergy) methods. The frequency of blaTEM, blaCTX-M, and blaSHV genes were determined via using specific primers and polymerase chain reaction (PCR) method.
Findings: Of 95 E. coli isolates, 24 samples (25.3%) were ESBL-positive and 71 (74.7%) were ESBL-negative samples. The frequency of blaCTX-M, blaTEM, and blaSHV genes was 47.5%, 37.5%, and 4.17%, respectively. The highest antibiotic resistance among isolates was to ampicillin (83.2%), cefixime (69.5%), and trimethoprim/sulfamethoxazole (co-trimoxazole) (67.4%), and the most antibiotic sensitivity was to imipenem (90.5%), norfloxacin (86.3%), and nitrofurantoin (83.2%).
The results showed that prevalence of ESBL-producing E. coli in children was 25.3% and blaCTX-M gene was the most common. According to these findings and relatively high level of resistance to third-generation cephalosporins, the need for more medical care in the correct and appropriate use of antibiotics is concluded; further studies on this subject are recommended, too.

Pseudomonas aeruginosa is one of the major pathogens causing burnt wound infection in hospitals. This study aimed to evaluate the prevalence of exoenzyme U (exoU) and exoenzyme S (exoS) genes and the antibiotic resistance pattern of Pseudomonas aeruginosa isolated from burn patient's samples in Kermanshah City, Iran.
In this cross-sectional study, 194 samples were tested with conventional bacteriological methods. After evaluation of antibiotic sensitivity with disc diffusion method, specific primers were deployed to assess the frequency of exoU and exoS genes among isolates. The retrieved data were analyzed using SPSS software.
Findings: From 91 isolates of Pseudomonas aeruginosa, 72 (79.1%) were multi-drug resistant (MDR) isolates. The most prevalent antibiotic resistances were against gentamicin (79.1%) and ceftazidime (74.7%); the most prevalent sensitivities were against colistin (100%) and polymixin B (92.3%). The frequency of exoU and exoS genes was 80.2% and 68.1%, respectively. There were significant relationships between the frequency of exoU gene and resistance to ceftazidime (P = 0.041) and cefotaxime (P = 0.050).
Considering the role of Pseudomonas aeruginosa in burn wound infections and the role of cytotoxin and antibiotic resistance genes in colonization and survival of this bacteria, avoiding home remedies, accurate detection of virulence factors, and recognition of antibiotic resistance pattern among the isolates in order to choose the appropriate antibiotic regimen to prevent infection seem to be necessary.

Considering the zinc sulfate as an immunumedolator in antibody production, the aim of this study was to investigate the effect of zinc sulfate on the immunological response of pneumococcal vaccines in elderly people over 65.
In this case-control study in 2012, 120 patients (over 65 years old) were selected and randomly divided into two separate equal study and control groups. Pneumococcal vaccine injected with the dose of 23 ppv to study and control group then zinc sulfate supplement capsule taken by the study group and a sugar capsule as a placebo by control group for one month period as well. Blood samples were taken before and one month after vaccination, specific antibody (Ab) level against pneumococcal polysaccharide capsule, was measured with Maxisorb ELISA kit. Then findings interpreted with Stata software version 8 (sas ver 8, USA), a t-test was done for assessment of the relationship between independent variables. The effect of zinc, age, smoking and BMI has been assessed on the level of Ab production with regression interpreter.
Results and The average increase in antibody levels before and one month after vaccination in the control group, 42.87 ± 25.21 to 118.87 ± 29 and in the study group were from 41.76 ± 27.51 to 117.66 ± 32.53 units per mL. Zinc, age, sex, BMI and smoking with 95% reliability had no effect on antibody production in both groups. subscription of zinc sulfate for one month period as an immunomodulator after pneumococcal vaccination has no significant effect on the level of antibody production in response to pneumococcal 23 valent vaccines.